I swapped in an edelbrock 1405 recently and have started having problems with it running rich at idle and sometimes it idles high (2k rpm with the choke off, blip the throttle and it drops back down to 800)
Fuel pressure at the carb is 3.5 psi
Timed at 14° BTC
Spark Plugs gapped to .045
Distributor is a GM HEI with MSD Cap, rotor, coil and ignition module
Vacuum at idle is 16 in Hg
It sometimes breaks up under acceleration, but doesn't necessarily bog. Great throttle response, but the idle is hit or miss.
When its cold it runs so rich my eyes burn and there is visibly faint white smoke until it warms up. The smoke smells like fuel, not oil.
I talked to edelbrocks tech department and they told me to clean the air bleeds in the primary venturis as well as the idle mixture screws, which I did. Very little improvement . I plan to buy their calibration kit, but I want to get the idle straight first. I've capped off all of the vacuum lines (reconnected before driving) to search for vacuum leaks and have found nothing. I'm at a loss to get this thing running right again.
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Fuel pressure at the carb is 3.5 psi
Timed at 14° BTC
Spark Plugs gapped to .045
Distributor is a GM HEI with MSD Cap, rotor, coil and ignition module
Vacuum at idle is 16 in Hg
It sometimes breaks up under acceleration, but doesn't necessarily bog. Great throttle response, but the idle is hit or miss.
When its cold it runs so rich my eyes burn and there is visibly faint white smoke until it warms up. The smoke smells like fuel, not oil.
I talked to edelbrocks tech department and they told me to clean the air bleeds in the primary venturis as well as the idle mixture screws, which I did. Very little improvement . I plan to buy their calibration kit, but I want to get the idle straight first. I've capped off all of the vacuum lines (reconnected before driving) to search for vacuum leaks and have found nothing. I'm at a loss to get this thing running right again.
Sent from my SM-G930V using Tapatalk
